File: align.c

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/* align.c -- test alignment (important for 16-bit systems)

   This file is part of the LZO real-time data compression library.

   Copyright (C) 2011 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2010 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2009 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
   All Rights Reserved.

   The LZO library is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of
   the License, or (at your option) any later version.

   The LZO library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with the LZO library; see the file COPYING.
   If not, write to the Free Software Foundation, Inc.,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

   Markus F.X.J. Oberhumer
   <markus@oberhumer.com>
   http://www.oberhumer.com/opensource/lzo/
 */


#if 0
#include "src/lzo_conf.h"
#include "src/lzo_ptr.h"
#endif
#include "lzo/lzoconf.h"

/* utility layer */
#define WANT_LZO_MALLOC 1
#include "examples/portab.h"


int opt_verbose = 0;


/*************************************************************************
//
**************************************************************************/

unsigned long align_test(lzo_bytep block, lzo_uint len, lzo_uint step)
{
    lzo_bytep b1 = block;
    lzo_bytep b2 = block;
    lzo_bytep k1 = NULL;
    lzo_bytep k2 = NULL;
    lzo_bytep k;
    lzo_bytep x;
    lzo_uint offset = 0;
    unsigned long i = 0;

    assert(step > 0);
    assert(step <= 65536L);
    assert((step & (step - 1)) == 0);

    for (offset = step; offset < len; offset += step)
    {
        k1 = LZO_PTR_ALIGN_UP(b1+1,step);
        k2 = b2 + offset;
        if (k1 != k2)
        {
            printf("error 1: i %lu step %ld offset %ld: "
                   "%p (%ld) %p (%ld)\n",
                   i, (long) step, (long) offset,
                   k1, (long) (k1 - block),
                   k2, (long) (k2 - block));
            return 0;
        }
        if (k1 - step != b1)
        {
            printf("error 2: i %lu step %ld offset %ld: "
                   "%p (%ld) %p (%ld)\n",
                   i, (long) step, (long) offset,
                   b1, (long) (b1 - block),
                   k1, (long) (k1 - block));
            return 0;
        }

        assert(k1 > b1);
        assert(k2 > b2);
        assert((lzo_uint)(k2 - b2) == offset);
        assert(k1 - offset == b2);
#if defined(PTR_ALIGNED_4)
        if (step == 4)
        {
            assert(PTR_ALIGNED_4(k1));
            assert(PTR_ALIGNED_4(k2));
            assert(PTR_ALIGNED2_4(k1,k2));
        }
#endif
#if defined(PTR_ALIGNED_8)
        if (step == 8)
        {
            assert(PTR_ALIGNED_8(k1));
            assert(PTR_ALIGNED_8(k2));
            assert(PTR_ALIGNED2_8(k1,k2));
        }
#endif
#if defined(PTR_LINEAR)
        assert((PTR_LINEAR(k1) & (step-1)) == 0);
        assert((PTR_LINEAR(k2) & (step-1)) == 0);
#endif

        for (k = b1 + 1; k <= k1; k++)
        {
            x = LZO_PTR_ALIGN_UP(k,step);
            if (x != k1)
            {
                printf("error 3: base: %p %p %p  i %lu step %ld offset %ld: "
                       "%p (%ld) %p (%ld) %p (%ld)\n",
                       block, b1, b2,
                       i, (long) step, (long) offset,
                       k1, (long) (k1 - block),
                       k, (long) (k - block),
                       x, (long) (x - block));
                return 0;
            }
        }

        b1 = k1;
        i++;
    }

    return i;
}


/*************************************************************************
//
**************************************************************************/

#define BLOCK_LEN   (128*1024ul)

int main(int argc, char *argv[])
{
    lzo_bytep buf;
    lzo_uint step;

    if (argc >= 2 && strcmp(argv[1],"-v") == 0)
        opt_verbose = 1;

    if (lzo_init() != LZO_E_OK)
    {
        printf("lzo_init() failed !!!\n");
        return 3;
    }
    buf = (lzo_bytep) lzo_malloc(2*BLOCK_LEN + 256);
    if (buf == NULL)
    {
        printf("out of memory\n");
        return 2;
    }

#if defined(lzo_uintptr_t)
    printf("Align init: %p ( 0x%lx )\n", buf, (unsigned long) (lzo_uintptr_t) buf);
#elif defined(__LZO_MMODEL_HUGE)
    printf("Align init: %p ( 0x%lx )\n", buf, (unsigned long) buf);
#else
    printf("Align init: %p ( 0x%lx )\n", buf, (unsigned long) (size_t) buf);
#endif

    for (step = 1; step <= 65536L; step *= 2)
    {
        lzo_bytep block = buf;
        unsigned long n;
        unsigned gap;

        gap = __lzo_align_gap(block,step);
        block = LZO_PTR_ALIGN_UP(block,step);
        if (opt_verbose >= 1)
            printf("STEP %5lu: GAP: %5lu  %p %p %5lu\n",
                   (unsigned long) step, (unsigned long) gap, buf, block,
                   (unsigned long) (block - buf));
        n = align_test(block,BLOCK_LEN,step);
        if (n == 0)
            return 1;
        if ((n + 1) * step != BLOCK_LEN)
        {
            printf("error 4: %ld %lu\n", (long)step, n);
            return 1;
        }
    }

    lzo_free(buf);
    printf("Alignment test passed.\n");
    return 0;
}


/*
vi:ts=4:et
*/